Grease coupler



FIG. 1 is a front perspective view of a grease coupler showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The dashed broken lines depict portions of the grease coupler that form no part of the claim. 

CLAIM The ornamental design for a grease coupler, as shown and described. 